Mozilla Foundation seeks a Major Gifts Officer (remote in Canada, Germany, UK, or US) to identify, cultivate, solicit, and steward a portfolio of major donors capable of giving $50,000–$1M+. Responsibilities include personal solicitation and closing of major gifts, pipeline and moves management, documentation in Salesforce, designing stewardship activities and donor events, and partnering with prospect research and program/executive staff to develop tailored proposals. The role requires a proven track record of personally securing major gifts and strong CRM, proposal writing, and relationship-management skills.

MZLA (Thunderbird) is hiring a Staff Product Engineer to own AI-enabled product features for Thunderbolt from concept through launch and iteration. The role is full‑stack and enterprise-focused, involving LLMs, RAG, agents, integrations, APIs, observability, and open‑source collaboration. This is a remote, full‑time position; applicants must reside in and have permanent work authorization for the country locations the posting specifies, and the company does not provide visa sponsorship. Salary ranges are specified in the posting for Canada and the US.

Reporting to the Head of Finance, this role manages daily general ledger operations, monthly/quarterly/annual close, inter-company accounting, cash and treasury, tax compliance coordination, audits, and internal controls across one nonprofit and two for-profit entities (one international). Requires 7+ years accounting experience and strong US GAAP, nonprofit and for-profit accounting, and systems/automation skills.

Join Mozilla’s Release Engineering team to develop and maintain scalable build, test, and release systems (CI/CD/continuous deployment) used to ship Firefox. The role involves improving developer experience, collaborating with distributed teams across North America and Europe, responding to critical service outages during normal hours, and working primarily with Python, cloud resources (AWS/GCP/Azure), and shell scripting. Minimum required experience: 2 years in an object-oriented programming language.

The role focuses on developing scalable software and improving build, test, and release pipelines used to deploy Firefox. Responsibilities include implementing developer-experience improvements, collaborating with distributed teams across North America and Europe, handling critical service outages during working hours, and participating in code reviews. The position requires at least 2 years of OOP experience (preferably Python) and experience with cloud resources (AWS, GCP, or Azure). Hiring range (Remote France): €44,000–€58,000 EUR per year.

Join Mozilla’s Release Engineering team to develop and optimize build, test, and deployment pipelines for Firefox. The role requires at least 2 years of OOP experience (preferably Python), familiarity with CI/CD and cloud resources (AWS/GCP/Azure), shell scripting, and working across distributed teams.

Own the shared foundation and building blocks that let other software act inside Firefox. Responsibilities include advancing the WebDriver BiDi standard, building Firefox-specific capabilities, designing user-facing safety controls, defining strategy for third-party AI assistants, and serving internal teams and external tools. Success is measured by adoption, usage volume, and sustained reliability and security.

Remote (Netherlands) role owning the shared foundation that lets other software drive Firefox. Responsibilities include designing safety controls, advancing the WebDriver BiDi standard and Firefox-specific capabilities, defining strategy for third-party AI assistants, and serving internal and external developers. Success measured by adoption, usage volume, and sustained reliability and security. Listed hiring range: €104,000–€138,000 (EUR, annual).

Owning the shared layer and strategy for software-driven control of Firefox (used by internal teams and external AI tools). Responsibilities include making the platform secure and reliable, advancing the WebDriver BiDi standard, designing user safety controls, defining third-party AI assistant strategy, and measuring adoption, usage, reliability, and security.

Mozilla seeks a technical product manager to own the shared foundation used by internal teams and external tools to drive Firefox (browser control platform). Responsibilities include pushing the WebDriver BiDi standard, building Firefox-specific capabilities, designing safety and user-approval controls, defining strategy for third-party AI assistants, and measuring success by adoption, usage volume, and sustained reliability and security. Role is remote (Belgium). Hiring range listed: €104,000–€139,000 EUR per year.

Role owns the shared foundation and building blocks that allow internal teams and external tools to drive Firefox, including advancing WebDriver BiDi and designing safety controls. Responsible for strategy and execution for a technical, developer-focused platform; measured on adoption, usage volume, reliability, and security. Hiring range listed: €72,000–€96,000 (EUR, annual).

Mozilla seeks a senior staff product manager to own the shared foundation that lets other software drive Firefox. Responsibilities include defining platform strategy, advancing the WebDriver BiDi standard, designing user safety controls, supporting internal teams and third-party AI tools, and measuring adoption, usage volume, reliability and security. Role is technical and hands-on, oriented to developer-space and platform-level product work. Hiring range (Remote UK): £111,000–£148,000 GBP per year.

Role owns the shared foundation and building blocks that let other software act inside Firefox, pushes the WebDriver BiDi standard, designs safety controls for user approval and visibility, and defines strategy for third-party AI assistants. Measures include adoption, usage volume, reliability, and security. Position is remote in France with listed salary range €90,000–€120,000.

Senior Staff Product Manager responsible for the foundation that lets software act inside Firefox: defining strategy and building reliable, secure building blocks (including advancing WebDriver BiDi), designing safety controls for users, and serving internal teams and external AI tools. Success metrics include adoption, usage volume, and sustained reliability and security. Remote (Germany).

Lead portfolio planning, capital allocation, and governance; develop dashboards and reporting; coordinate cross-organization initiatives and operating forums; advise COO and Mozilla.org leadership. Requires 10+ years in multi-entity holding, investment management, private equity, VC, or similar portfolio role.

Own the Browser Control Platform: a secure, reliable shared foundation and building blocks used by internal teams and outside tools (including AI assistants). Drive product strategy and execution, advance the WebDriver BiDi standard and Firefox-specific capabilities, design safety controls for user trust, and measure adoption, usage, reliability, and security.

MZLA (Thunderbird) seeks a Staff Designer focused on rapid prototyping and design-to-code execution for Thunderbolt, an open-source AI client. The role combines product & interaction design with front-end engineering to create prototypes, reusable patterns, and production-quality UI—emphasizing accessibility, usability, security, and enterprise needs. Remote in Canada; 10+ years of relevant experience and strong JavaScript/TypeScript and component-based framework skills required. Salary range: CAD 155,000–175,000. Visa sponsorship is not provided.

Join MZLA/Thunderbird as a Staff Design Engineer focused on rapid prototyping and production-quality front-end work for Thunderbolt, an open-source AI client. Responsibilities include building prototypes in the codebase, defining interaction patterns for AI-powered features, improving usability/accessibility, and contributing reusable components and design-system elements. Role is fully remote (US only), requires 10+ years of relevant experience, and the posted US salary range is $185,000–$205,000 USD per year; visa sponsorship is not provided.

Lead the Marketing Data Science team at Mozilla/Firefox, owning global data strategy, measurement (attribution, ROI, campaign performance), forecasting and budget optimization, MMM and causal approaches, LTV/retention modeling, segmentation, dashboards, and internal tools. Requires 6+ years in marketing data science and proficiency with Google Analytics and advertising platforms; includes team leadership and stakeholder management. Remote role.

Mozilla seeks a Marketing Data Science Manager to set strategy and roadmap for Marketing Data Science, establish measurement for attribution, ROI, and campaign performance, and build capabilities across performance and brand marketing, user insights, and reporting. Requires 6+ years in marketing data science and experience with tools like Google Analytics and modeling methods such as MMM, causal lift, saturation modeling, optimization, and Bayesian approaches.